Connecting The Electrical Wiring - Daikin Altherma EHY2KOMB28AA Installation And Operation Manual

6 Installation
b Cold water inlet
c Pressure relief valve (field supply)
2 Install a pressure relief valve according to local and national
regulations (if required).
3 Connect the hot water connection (Ø15 mm).
4 Connect the main cold water connection (Ø15 mm).
DANGER: RISK OF BURNING
In case of high leaving water set points for space heating
(either a high fixed set point or a high weather-dependent
set point at low ambient temperatures), the heat exchanger
of the boiler can be heated up to temperatures higher than
70°C.
In case of a tapping demand, it is possible that a small
volume of water tapping (<0.3 l) has a temperature higher
than 70°C. To prevent scalding, it is recommended to
install a thermostatic valve according to the following
schematic:
d
a=boiler, b=domestic hot water from the boiler, c=cold
water inlet, d=shower, e=thermostatic valve (field supply)
To connect the water piping for domestic hot
water (applicable for Switzerland)
For Switzerland, domestic hot water should be made by a domestic
hot water tank. The domestic hot water tank must be installed with a
3-way valve to the space heating piping. Refer to the manual of the
domestic hot water tank for more details.
Flow resistance graph for appliance domestic hot
water circuit
Not applicable for Switzerland
l/min
15
13
11
9
7
5
3
1
0 0.2 0.4 0.6 0.8 1.0 1.2
A 28 kW
B 32 kW
The minimum flow for domestic hot water operation is 2 l/min. The
minimum pressure is 0.1 bar. A low flow (<5 l/min) can reduce
comfort. Make sure to set the setpoint high enough.
Installation and operation manual
14
a
b c
e
B
A
bar
1.4 1.6 1.8 2.0
To connect the water piping for space heating
NOTICE
To prevent leakages, do NOT rotate existing connections.
NOTICE
Mount the pipes without tension to avoid ticking sounds
from the pipes.
1 Rinse the space heating installation carefully.
2 Connect the space heating outlet (a) and space heating inlet (b)
to their connections as indicated in the following illustration:
a
Fit the space heating installation with the following parts:
▪ A filling/draining tap in the space heating inlet, immediately
underneath the unit.
▪ A draining tap at the lowest point of the installation.
▪ An overflow valve of 3 bar in the input pipe at a distance of no
more than 500 mm from the unit. Between the unit and the
overflow valve there may be no valve or constriction.
▪ An expansion vessel in the space heating inlet (in the B-pack or in
the installation).
▪ If there are pipes running up, use a check valve within close
distance of the unit. This prevents a thermosiphon effect from
occurring during tap water operation.
Note that the optional valve kits EKVK4A and EKVK6A can also be
used to connect the space heating installation.
NOTICE
Make sure that the straight brass fitting connections are
tightened thoroughly to prevent leakage. Maximum torque
is 30 N∙m.
To fill the domestic water circuit of the gas boiler
1 Open the main tap to pressurize the hot water section.
2 Vent the exchanger and the pipe system by opening a hot water
tap.
3 Leave the tap open until all air has disappeared from the
system.
4 Check all connections for leaks including internal connections.
6.6

Connecting the electrical wiring

DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
Daikin Altherma hybrid monobloc – Gas boiler module
b
EHY2KOMB28+32AA
4P538953-1 – 2018.06